CAR MECHANIC SIMULATOR 2021 MODS: THE BEST ONES

I have sunk a truly stupid number of hours into Car Mechanic Simulator 2021, and most of them were not on the vanilla game. The base game is good. The modded game is the reason I keep coming back five years later. The modding community for this title is one of the most active I have ever seen in a simulator, and that is saying something because the sim genre tends to attract the kind of obsessive hobbyists who build entire careers out of unpaid Photoshop work.

If you just bought CMS 2021, or if you are replaying it while you wait for the next game to finally come out, this is the guide I wish someone had handed me. I am going to run through the car packs I actually use, the quality of life mods that make the game less of a pain, the mods that add legitimately new gameplay systems, and then how to install all of it without corrupting your career save.

For the record, I am not getting paid by any modder. I am just a guy with 400 hours in this game and a garage full of modded engine swaps that probably should not exist.

Why the CMS modding scene is so good

Before I get into specific mods, I want to talk about why this community is special, because it matters for which mods I recommend and why.

PlayWay shipped CMS 2021 with Steam Workshop support from day one, and the game uses a relatively open file structure for cars. That meant modders did not need to crack anything or reverse engineer obscure formats. They could just build cars, plug them into the workshop, and ship them. The barrier to entry is genuinely low for anyone who already knows their way around 3D modeling software, and the reward is immediate because thousands of players will download your car and leave enthusiastic comments about the reflections on the hood.

The result is a Workshop library that has grown into something wild. There are thousands of cars, many of them better than the official DLC. There are conversion mods, swap kits, engine packs, UI reskins, lighting tweaks, and full career overhauls. If you want to see what happens when you let a community loose on a simulator with proper tools, CMS 2021 is the case study.

Compare this to something like BeamNG, which also has a great modding scene but with a much higher technical ceiling, or Automation, where the mods tend to be more about sharing creations than changing the core game. CMS sits in a sweet spot where modders can add a new 1990s Japanese coupe in a weekend and have fifteen thousand people drive it the next morning. Speaking of Automation, there is a whole separate conversation about how that game compares and what it does that CMS does not, which I went into in my Automation game review if you want that rabbit hole.

The car packs worth installing

The official DLC car packs are fine. Some are great, some are filler. The community packs, if you pick the right ones, consistently outclass the paid options.

JDM Pack mods

The JDM scene in CMS is enormous. There are individual car mods for basically every famous Japanese car you can think of, and there are curated packs that bundle ten or fifteen of them together with consistent quality. The best ones include the R32, R33, and R34 Skylines, the various Supra generations, the RX-7 across all its body styles, the Silvia S13, S14, and S15 lineup, the AE86, and a handful of Evos and STIs.

The quality varies. Some modded JDM cars are nearly indistinguishable from official DLC in terms of model detail and engine bay accuracy. Others are clearly rushed, with missing interior textures or engines that are just a single mesh you cannot actually work on. My rule of thumb is to check the screenshots for engine bay shots before downloading. If the modder shows the engine, the engine is probably detailed. If they do not, it is probably a shell.

For a starter pack, grab the Skyline GTR line and the Supra MK4. Those two alone will fill dozens of hours because they have deep engine bays, extensive tuning support, and tons of community follow up mods for parts.

European Pack mods

The European car coverage in vanilla CMS 2021 is decent but DLC heavy. Modders filled the gaps aggressively. You can find hot hatches like the Golf GTI across multiple generations, the Peugeot 205, the Clio Williams, and various Renaultsport builds. The BMW coverage is also great, with E30s, E36s, and E46s that often include proper engine options like the S52 and S54 swaps.

What I personally use most is a set of classic French and Italian cars that the official game mostly ignores. The Citroen 2CV mod is hilarious and strangely satisfying to work on because the engine is so simple you can tear it apart and rebuild it in fifteen minutes. The Alfa Romeo GTV and the Fiat 500 are also community favorites and both have high detail models.

American Muscle Pack mods

This is where the modding scene gets a little weird, because the official Dodge DLC is pretty good, but the community built out the Ford and Chevy sides of the muscle car world with a passion that suggests some modders have personal vendettas. You can find 1969 Camaros, 1970 Chevelles, 1968 Mustang Fastbacks, classic GTOs, and Chargers in basically every configuration.

The big muscle pack mods tend to bundle ten or twelve cars together. The quality is usually high because muscle cars are popular enough that modders compete to make the best versions, and the end result is that you can end up with a garage full of high detail American iron without spending a cent on DLC.

If you are into the tuning side of this more than the restoration side, I wrote about how CMS fits into the broader tuning genre in best car tuning games. CMS is more restoration than street tuning, but with the right mods it slides pretty far into tuner territory.

Quality of life mods

This is the section that changes the most depending on your patience level, because half of these fix things that really should not have shipped broken in the first place.

Better lighting mods

The stock garage lighting in CMS 2021 is yellow and flat. It looks like a 2004 render of a gas station. There are several community lighting mods that replace the garage illumination with something closer to modern shop lighting, which actually lets you see the engine bay without leaning into the screen. My favorite is a mod that adds directional work lights you can position manually, which sounds dorky but is genuinely useful when you are trying to spot a cracked hose on a dark engine block.

Reshade presets also live in this category. They are technically not mods in the Workshop sense, but you can drop a reshade config into the game folder and get significantly better contrast and color accuracy. There are community presets specifically tuned for CMS that improve the look without tanking your framerate.

UI improvements

The vanilla UI is serviceable but aging. The parts catalog gets unwieldy when you are working on a complex car with hundreds of possible components, and the stock sort filters only give you basic options. There are mods that add better search, better filtering, and better sorting by price, condition, or compatibility. One of the more popular ones adds a favorites system so you can pin parts you use constantly without digging through menus.

There is also a mod that overhauls the main menu and makes the pause menu actually legible. It is a small thing, but spending hundreds of hours staring at a clunky menu adds up.

Sort filters

Related but distinct from general UI mods, there are specific sort filter mods that let you organize your garage inventory more efficiently. If you do a lot of barn finds and abandoned car missions, you end up with hundreds of parts in your inventory, and being able to sort by "parts that actually fit the car I am working on" instead of browsing a giant list is a huge time saver. This sounds minor until you have spent twenty minutes looking for a specific bolt.

Fast travel and path skip mods

The vanilla game makes you walk between car lifts, the computer, the test track, and the parts shop. Some people like this. I do not. There are mods that either speed up the walk animation significantly or let you teleport between key locations. If the path system is the thing that keeps making you close the game in frustration, these are essential.

Mods that add new mechanics

This is where things get interesting. The mods above improve the existing game. These ones add gameplay systems the developers never shipped.

Custom paint jobs

Vanilla CMS 2021 has paint but not real paint. You can change colors, you can do two tone in limited ways, but you cannot do proper custom liveries, rally stripes, race numbers, or detailed graphics. There are mod packs that add a much expanded paint system, with layered decals, wider color libraries, and the ability to import your own designs through community tools.

The livery editor mods are not quite as deep as what you get in a proper racing game like Forza Horizon, but they are shockingly close, and being able to build a full racing livery for a modded Skyline GTR is the kind of thing that turns a four hour session into a twelve hour session.

Performance parts

This is the mod category that fundamentally changes how the game plays. There are mods that add turbo and supercharger kits to cars that do not have them in vanilla, mods that add camshaft and head upgrades with real performance implications, and mods that unlock engine swap combinations that the base game restricts.

My personal favorite is a mod that adds a proper forced induction tuning system, letting you tune boost, wastegate, and intercooler settings in a way that actually affects dyno numbers. This is the closest CMS gets to being a proper tuner sim, and it pairs beautifully with some of the JDM car mods because suddenly you can build a genuine 800 horsepower RB26 monster instead of just bolting on the same generic parts the game ships with.

There are also mods that add realistic engine wear, more detailed diagnostic tools, and mechanical failure systems that make cars behave more like actual broken cars. If you want to know whether the base game actually teaches useful skills in the first place, I wrote about that specifically in does car mechanic simulator teach you because it is a question that comes up a lot.

Career overhaul mods

A few ambitious modders have built full career overhauls that restructure progression, job difficulty, and economy balance. These usually require a fresh save, and they are not for everyone, but if you bounced off the vanilla career for economy reasons, an overhaul mod might fix the specific things that bothered you.

The most popular overhaul mods reduce money grind, make jobs scale in difficulty more organically, and add new customer types with different expectations. It is the kind of change that would normally require a full sequel, and the community just shipped it for free.

How to install mods

There are two paths. Steam Workshop is the easy one. Manual installation is the one that unlocks the best stuff.

Steam Workshop

Open the game's Workshop page through Steam, subscribe to the mods you want, launch CMS 2021, and they show up automatically. The game has an in-game mod menu where you can toggle individual mods on and off, which is useful if one of them causes a crash and you need to narrow down the cause.

The Workshop is great for casual modding. The downside is that not every mod is on there. Some of the best car packs are hosted on third party sites because the modder did not want to deal with Workshop's restrictions or because the mod includes content that violates Workshop rules, like real manufacturer branding or copyrighted designs.

Manual installation

Manual installation is how you get the really good stuff. You download a mod file, usually a .zip or .pak file, and drop it into the CMS 2021 mods folder. The exact path depends on your Steam library location, but it is typically under the game's install directory in a folder called Mods or Workshop content.

The community has built several mod managers that automate this for you. Some are simple file copiers. Others are full profile managers that let you switch between different mod setups for different save games. If you plan to install more than five or six mods, grab a manager. It is not strictly necessary, but it makes troubleshooting ten times easier.

A few install tips I learned the hard way. Back up your save before installing anything major, especially career overhauls or economy mods. Do not install two mods that change the same system at once. Read the mod descriptions for compatibility notes because some mods require specific load orders. And if the game crashes on launch after installing something, disable mods one at a time until you find the culprit. There is no clever shortcut.

A few mods to skip

I do not want to call out specific mods by name because that feels rude, but there are categories I personally avoid.

Ultra realistic damage mods sound cool but usually just make the game frustrating. They add failure states that were not balanced against the career economy, so you end up spending more on repairs than you earn on jobs.

Cheat mods are self explanatory. There are mods that give you infinite money or instant skill unlocks. Install them if you want, but the satisfaction of the game comes from the progression, and cheating through that usually means uninstalling a week later because you are bored.

Low effort car packs that bundle fifty cars are almost always quantity over quality. You are better off with five well made cars than fifty half finished ones. Check the screenshots and the recent comments. If people are complaining about missing textures, skip it.

One more thing

If you like the garage simulator loop in general and you have exhausted CMS 2021 even with mods, there are a handful of adjacent games worth checking out. I rounded up the broader category in garage simulator games, which covers the stuff in the same space, from shop sims to tuning games to flip-and-sell titles. Some of them scratch different parts of the same itch.

CMS 2021 with the right mods is still the best pure wrenching sim you can buy. The next game might eventually replace it, but until we see the modding scene migrate, I am staying on 2021. The community built something here that no developer could have shipped on their own, and that is the real reason this game has lasted as long as it has.